Q1, Q2, Q3, and Q4 represent the four quarters of a fiscal year, commonly used in business and finance to divide the year into manageable segments for reporting and analysis. Each quarter typically lasts three months, with Q1 encompassing January to March, Q2 from April to June, Q3 from July to September, and Q4 from October to December. Analyzing performance by quarter helps organizations track progress, assess financial health, and make informed strategic decisions.